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What is this? Unicode text? What's the difference between it and ordinary words?
Unicode text is text written in Unicode encoding.

Ordinary text is written in English ASCII code.

Unicode uses 16 bit encoding, while ASCII uses 7 bit encoding, and the encoding meaning has its own definition. Although GB is also a 16 bit encoding, its encoding meaning is completely different from unicode.

Unicode text should have a certain structure besides 16 bit code to distinguish the beginning and end of the language.

To display unicode text, in addition to the display software, there must be a unicode font (font file) corresponding to a certain language.